%I
%S 90,18,18,54,72,18,18,18,36,18,18,72,54,36,36,18,36,72,18,36,54,54,18,
%T 18,54,18,18,18,36,36,18,36,36,36,54,18,18,18,36,18,18,36,18,54,18,18,
%U 90,18,18,36,18,18,18,18,18,18,18,72,18,18,54,18,18,54,18,36,18,18,36,18,36,18,18,54,54,36,18,18,18,18,18
%N First differences of A247679
%C All terms have digital root equal to 9.
%H Odimar Fabeny, <a href="/A247899/b247899.txt">Table of n, a(n) for n = 1..10000</a>
%Y Cf. A247679.
%K nonn,easy
%O 1,1
%A _Odimar Fabeny_, Sep 26 2014
